DE3414531A1 - HOSE-Lined LINING MATERIAL FOR PIPELINES, IN PARTICULAR WITH NON-STRAIGHT SECTIONS - Google Patents

Description

34U531

The invention relates to lining material for pipelines, in particular gas pipes or water pipes for the public Water supply. In particular, the invention relates to tubular lining material for lining Pipelines that have different sections with different inside diameters and / or multiple intricate bends and have bent portions in a single pipeline system.

Very old or damaged pipelines for gas or water can leak dangerously. One Damage to underground pipelines by external forces or old age causes the extremely dangerous Outbreak of gas or water. In particular, the tearing of underground pipelines due to obsolescence occurs suddenly and is unpredictable. The only effective countermeasure so far is to remove the underground Digging out pipelines for tens or hundreds of meters before they become obsolete and replacing them with new ones. this however, requires a considerable amount of work and time as well as high costs when replacing the pipelines in addition to Difficulties in replacing the pipes themselves. Furthermore, the public water or gas supply must for a longer period Interrupt the period of time until the work to replace the pipe has been completed. Are the obsolete Pipes under public roads, this leads to considerable impairment, since the traffic on the road in question must be restricted while working on the pipes. However, this exchange of underground pipelines is practically ineffective if the pipelines protect against external forces such as earthquakes, heavy traffic loads or road repair work, should be strengthened. To pipeline

L J

Γ H

To reinforce lines against such external forces, the individual pipe can be reinforced with a lining material before the installation of the pipelines. However, this measure cannot be applied to pipelines that are already installed underground.

A simple method for lining underground pipes is known in which a flexible plastic hose inserted into the underground pipes and glued to their inner surface; this procedure was used to repair it and reinforcing damaged pipes to withstand mechanical impacts from external forces can. With this method, however, the introduction of the flexible hose into the underground pipe is extremely

15th

borrowed difficult, so that it is practically unusable in cases is where the pipelines are long and / or curved. Further developments of this simple procedure existed in inserting a flexible hose into pipes in such a way that the hose is through a pressurized

of the agent (liquid or gas) and glued to the inner surface of the pipes with the help of an adhesive (see US Pat. Nos. 2,794,758, 3,132,062 and 3,494, and British Pat. No. 1,069,623). Although this procedure is an improvement when inserting the flexible liner tube

25th

brought into the pipes, they are still not satisfactory. These known methods require the prior application of an adhesive to the inner surface of the pipe or of the hose before inserting the hose into the pipe.

These known methods have several disadvantages: 30th

The amount and distribution of the adhesive cannot be controlled, so that the adhesive is often unevenly applied to the Inside surface of the pipe is applied; furthermore, when the pipe is inclined, the pressure of the adhesive only acts

to the leading end or turning point of the hose that 35

when turning the hose moves forward within the tube, so that the necessary to turn the hose

Pressure fluctuates and the amount of adhesive applied changes changes.

To improve on these known methods, new methods of lining are disclosed in U.S. Patents 4,368,091 and 4,334,943 of pipes have been suggested that give very good results in lining pipelines, in particular have routed underground pipes with flexible, reinforcing hoses. In these known methods a tubular lining material introduced into the pipelines, which is turned around and at the same time a binder is uniformly applied to the inner surface of the lining material; the lining material is glued to the inner surface of the pipelines with the adhesive in between, namely under Exposure to a pressurized fluid (liquid or gas). In the case of the method according to the last mentioned Patent is a further improvement in a rope-like, elongated element beforehand through the tubular Introduce lining material along its entire length before applying an adhesive evenly to the inner surface the lining material is applied; if then the lining material in a pipeline of its is inserted at one end and advances within the conduit as the lining material is turned and at the same time the adhesive is applied to the inner surface of the pipeline under fluid pressure, the rope becomes attracted at a constant speed from the other end of the pipeline. As a result, the high fluid pressure, the otherwise required to turn and move the lining material forward and to set the rate of turn, be reduced, so that a locally uneven application of the lining material, especially in the curved sections the pipeline is avoided. The process known from US Pat. No. 4,334,943 is therefore heretofore known as the most advantageous method of lining gas pipelines

L J

34U531

^Γ - 7 -

lines or water pipes with many bends and internal diameters of about 100 mm or more.

On the other hand, various types of tubular materials are used as linings for pipes or pipelines. For example, a tubular lining material with a three-layer sandwich structure with an innermost tubular Layered substrate with overlaid, woven or non-woven Fiber material impregnated with a thermosetting synthetic resin (thermosetting FRP lining material) and with a removable outer layer (see JP-PS 51-40595 (1976)). Such a laminated, tubular However, lining material cannot be used in the aforementioned advantageous lining methods, where the tubular material is turned for lining pipes. Furthermore, this laminated lining material not be applied to the inner surface of pipelines in bends or bends without becoming form wrinkles in the process. Different types of tubular lining materials with a nonwoven layer and with an impermeable film layer are disclosed in GB-PS 1 569 675, 1 340 068, 1 357 355 and 1 449 455, den U.S. Patent Nos. 4,009,063 and 4,064,211 and Japanese Patent Nos. 58-39646, 55-43890 and 58-33098. That in GB-PS 1 569 * The tubular laminate described has a felt made of synthetic fibers, such as polyester fibers, as well as a gas-impermeable one Layer of a synthetic resin such as polyurethane. However, this patent gives no indication of how that tubular laminate on the inner surface of pipelines

can be applied in particular in curved sections without the lining material in the curved Pipeline sections forms folds. The other known methods cited above relate to the lining of

Pipelines with a similar tubular laminate, 35

such as carded felt or mats made of synthetic fibers,

34H531

which are coated with a synthetic resin. The known lining methods according to these cited property rights are subject to the process according to US Pat. No. 4,334,943, in particular since these methods do not take into account that wrinkles and folds in the bends or bends of pipelines Gaps must be avoided. A tubular one Lining material made of a fabric and an impermeable layer of synthetic resin is also in the JP-OS 56-8229 described. This known tubular lining material consists of a knitted or woven Textile jacket in tubular form (with a warp thread made from a multi-fiber polyester thread and a weft thread a twisted polyamide yarn), which is covered with flexible natural or synthetic rubber and when exposed a pressure medium is expandable for turning in the transverse direction. Therefore, this lining material can be used at local Adjust changes in the inner diameter of the pipeline and, to a certain extent, the formation of folds of the Lining material and spaces between the

Reduce the internal area of the pipeline and liner material in an elbow. However, this effect is then still insufficient if the pipeline has a large number of bends or bent sections.

The previously known tubular lining materials are used exclusively to reinforce pipelines for gas or water in public supply networks with relative large inner diameters of the pipes (about 200 mm or more). On the other hand, supply lines and house pipelines,

which branch off from the relatively large pipelines for supplying the individual consumers, an inner diameter of about 27 mm (with 25 mm nominal inner diameter) in a straight pipe section. The inside diameter of this Supply lines fluctuate locally or in curved

cut from about 22 mm to about 34 mm (about 12 mm difference) . In this case, the inside diameter reaches

L J

34U531

differed from about 12 mm about 50% of the nominal inner diameter the supply lines. In the case of larger pipes, the inside diameter difference of around 12 mm is only a few Percent of the mean inner diameter and is mostly negligible. With such a large fluctuation in the inside diameter the lining of supply lines with conventional tubular lining material is extraordinary difficult even when using the method of US Pat. No. 4,334,943, which has heretofore been considered the most economical will.

To protect customers and companies against dangerous gas outbreaks in the event of unexpected damage to the supply lines, it is therefore necessary to also use pipes with a relatively small inner diameter to reinforce with lining material. So far, however, there is no tubular lining material, which is sufficiently elastic to adapt to large fluctuations in the inside diameter of relatively thin pipes and which is suitable for reinforcing such pipelines. There is therefore a significant need for a tubular Lining material used in pipelines with an inner diameter of 25 to 200 mm, especially in supply pipes and house pipelines can be used, which have many bends and strong fluctuations in the inside diameter.

sers have; this lining material is intended to prevent wrinkles from forming in pipe bends.

In contrast, the invention is based on the object a tubular lining for pipelines with relative

small inner diameter and several bends or curved sections.

The solution according to the invention is characterized in particular by the features of the claims. The inventive

tubular lining can be applied to the inner surface of pipelines without creasing, even in

^L J

Bends or curved sections with a large change in the inside diameter.

The lining according to the invention can be woven in the form of a hose be, the warp threads wholly or partially consist of an elastic yarn around the entire length normal and / or crimped synthetic fiber yarns are left and / or right twisted.

The tubular lining according to the invention can also in the method according to US Pat. No. 4,334,943 for lining pipelines with a relatively small inner diameter and can be used with multiple bends or curved sections.

In the context of the invention it has been found that the disadvantages can be avoided in the prior art with the tubular linings according to the invention. So that's it possible pipelines with many elbows or bent sections and relatively small inner diameter, such as supply lines and pipes in the house, with an impermeable, to be lined with a synthetic film, tubular textile jacket in a simple and smooth manner, the lining method according to US Pat. No. 4,334,943 can preferably be used. With the lining material the warp threads of the tubular textile jacket consist entirely or partially of an elastic one Yarn, around which a normal and / or crimped one over its entire length Synthetic fiber yarn or yarns are left and / or right twisted.

The invention is explained in more detail below with reference to the accompanying drawing. Show it:

L J

Figure 1

Figure 2

Figure 3 (A)

Figure 3 (B)

Figure 3 (C)

20 25 30 35

Figure 4

- 11 -

a schematic perspective view of a pipeline system for the gas supply, a schematic illustration to explain the method for lining a gas pipe with a tubular lining material, a perspective sectional view of the invention, tubular lining with a tubular textile jacket and a coating made of a flexible synthetic resin, a schematic enlarged view from above an example of the tubular textile jacket according to the invention of FIG. 3 (A), a schematic partial sectional view on an enlarged scale of an embodiment of the tubular textile jacket according to Figure 3 (A), a schematic representation during the lining a bend of a pipeline with a tubular lining, the outer diameter of which 130% of the inner diameter of the pipeline in the straight section or with excessive elongation in the longitudinal direction, a series of schematic representations of the lining process a bend of a supply line with a tubular according to the invention Lining,

schematic representations of the lining process of a pipe elbow with a hose-shaped one Lining with insufficient elongation in the longitudinal direction.

Examples of pipelines with a relatively small inner diameter and several complicated branches, bends or Curved sections are found in utility lines and pipelines in the house for gas or water coming from an underground Main pipeline are branched off. Households, shops and offices with gas or

characters
(A) - (C)

characters
6 (A) and (B)

34U531

Water supplied. The term "supply line" describes pipelines that have a main pipeline with a Connect gas or water meter installed in the consumer's building. Under the term "house pipeline" the individual pipelines in the building of the consumer, which are located after the measuring device, are designated. in the in general, the supply pipelines are also laid underground.

According to Figure 1 is a load feeder 2a with a branched Main pipeline connected. A branch pipe from the supply branch 2a extends over a bend 3a, a horizontal section 4a and a bend 3b into a T-shaped Section 5a of a branch pipe 5.

° Section 5a upwardly extending pipe is via a utility riser 6a connected to a supply branch 2b, while the lower part of the branch pipe 5 with a Siphon 7 is connected. A branch pipe from the supply branch 2b extends over a bend 3c, a horizontal

valley section 4b, an elbow 3d and an elbow 3e, emerges from the ground at a riser pipe 6b and is connected to a measuring device, not shown. If the straight path of the pipeline are obstacles, the horizontal sections 4a and 4b are by means of elbow-like

Pipe sections 8 bent in order to bypass the obstacles, so that the pipeline as a whole is relatively complicated and many has curved portions.

Generally the inside diameter of the supply line is

relatively small according to FIG. 1 and is usually nominally 25 mm. This pipe has an inside diameter of 27 mm in a straight line Pipe section, while the internal diameter can locally decrease to 22 mm or increase to 34 mm; this means one Inside diameter difference of about 12 mm, i.e. about 50%

the nominal inside diameter of utility or house pipelines. This is in contrast to main lines having

34H531

an inner diameter of about 200 mm or more, where there is fluctuation in the inner diameter even if there is a difference of 12 mm are practically negligible. Therefore one must tubular lining for utility or house pipelines can adapt to the strong fluctuations in their inner diameter, i.e. the tubular lining must be able to adapt completely to the inner surface of the lines, the inner diameter at least locally vary from 22 mm (in the narrowest section) to 27 mm (mean inner diameter of a straight pipe section) can. This lining must be applied evenly with no wrinkles or gaps between the Inner surface of the pipeline and the tubular lining material result; the lining must not only be on the inner surface of the pipelines in the straight pipe section but can also be applied to differently shaped pipe sections, such as elbows, e.g. supply branches 2a and 2b, the bends 3a to 3e, the T-shaped section 5a and the elbows 8 in Figure 1, where the tubes are bent approximately at right angles are; the tubular lining material must be applied to the inner surface and there to be adjust the respective shape completely and stay there.

With Figure 2, in particular, the lining method for such supply lines are explained; the supply line according to Figure 1 is shown schematically by a Supply branch 2a, pipe bends 3a, 3b, a pipe section with bends 3c to 3e and a riser 6b are shown, wherein the supply branch 2b, the T-shaped section 5a and a

Supply riser 6a are omitted compared to Figure 1.

The tubular liner 9 is made into a tubular shape and through weaving with a weft thread and special warp threads Applying a coating made of a flexible synthetic resin to the tubular textile jacket obtained. A

rope-like, elongated element 10 is then passed through the lining 9 over its entire length,

34U531

Γ - 14 - "1

before a binder or adhesive is evenly applied to the inner surface of the liner 9. The pretreated one Liner 9 is then wound flat on a spool 9A, and a roll of the tubular Liner 9 is then placed in a pressure vessel 12, which is provided with an inlet, not shown, for a pressurized pressure medium.

The rope-like, elongated element 10 can itself be a rope made of natural or synthetic fibers, but is preferred a belt or riana made of similar material, since the liner 9 is folded flat and wound onto the spool 9A is. This rope-like element 10 can approximately according to FIG JP-GM 58-50583 are previously pulled through the tubular liner by inserting a bullet-shaped needle whose rear part has a slightly reduced diameter and which is connected to the rope-like element, in the tubular liner in the folded state introduces the tubular lining from the outside of the

squeezes the rear part of the needle with a pair of nip rollers and pushing the needle forward within the tubular liner by pushing the nip rollers in Rotational movement offset. A binder or glue can easily be applied to the inner surface of the tubular liner

be applied in any suitable manner, for example by including a large amount of binder at one end of the liner and squeezing it together '/ wipe the nippers. An excess of binder or Adhesive can be reapplied to the other end of the liner.

will catch. Various adhesives can be used for this purpose, but non-volatile adhesives are preferred and those free from volatile solvents and moisture that would cause the liner to adhere to the inner surface of the Can affect pipelines. Are therefore preferred

solvent-free binders or adhesives that harden themselves at normal or elevated temperatures. Particularly preferred

Γ Π

- 15 -

Binders based on epoxy, acrylic and polyester are preferred, and a two-component epoxy synthetic resin is particularly preferred.

Furthermore, a leading, rope-like, elongated element 11 is also passed through the supply lines, wherein one end of the rope element 11 to any suitable one Point is connected to the rope element 10, which extends from End of the tubular liner 9 extends from, while the other end of the rope element 11 with a winch 13 outside the pipeline is connected. The liner 9 is unwound and passed through a nozzle 12A of the pressure vessel 12, and the free end of the liner 9 is in the everted or turned state on an annular fastening device 12B attached to the end of nozzle 12A. The riser pipe 6B of the supply line is directly or via an induction tube or an adapter (not shown) with the annular fastening device 12B connected. The rope element 11 is then moved forward by operating the winch 13 pulled while pressure medium is introduced into the pressure vessel 12 through the inlet, so that the liner 9 with the help of the rope element 10 progresses within the supply line and at the same time turns and thereby on the inner surface of the line is glued on, even in the area of bends or complicated curved sections. The turning speed of the liner 9 is controlled exclusively by the pulling speed of the winch 13 while the pressure medium is held in an advantageous manner at a pressure which is sufficient to turn the lining 9 on glue the inner surface of the pipeline.

However, in the case of relatively small utility or house pipelines with multiple elbows and complicated structure, the Force for inserting the lining into the pipelines due to the frictional resistance between the cable elements 10 and 11 and the inner wall of the pipelines in elbows or

- 16 1

34U531

curved sections significantly reduced, even if a higher force acts on the winch 13. Therefore, a conventional lining can hardly be passed through such supply or house pipelines in which the Inside diameter varies greatly and there are several complicated bends or bends.

Figure 3 shows the structure of the tubular according to the invention Liner in open form; here is a tubular textile jacket 14 on its outside with an airtight Coating 15 made of a flexible synthetic resin. The textile jacket 14 can be woven by means of special Warp thread 16 and weft threads 17 produced in tubular form are and is then coated on its outside with a synthetic resin, so the tubular according to the invention Get lining. Examples of usable synthetic resins are a polyester elastomer and a polyether-polyurethane elastomer. The polyester elastomer is a block copolymer of an aromatic polyester and an aliphatic one

Polyether diols; this is a flexible and Gas-impermeable, thermoplastic synthetic resin with excellent elasticity and deformability as well as resistance against heat, weather, oil, chemicals and abrasion.

The polyether-polyurethane-elastomer is made from a similar 25

Polyether diol and a polyisocyanate produced and has similar physicochemical properties. The thickness of the coating 15 varies according to the intended use and the inner diameter of the pipelines to be treated,

however, is generally in the range of about 0.2mm to 30

about 0.6 mm for lining supply or house pipelines for gas or water. In general, synthetic resins are advantageous as the base material for the coating 15 because they in contrast to Naturkatuschuk in the elongated state theirs Maintain shape permanently. Furthermore, the frictional resistance between the surfaces of the coating 15 is in the case of synthetic resins lower than with natural rubber, if the hose-shaped

L J

γ- Π

- 17 -

clothing moves forward within the pipelines.

The inner diameter of the textile jacket 14 varies accordingly the inside diameter of the pipelines to be treated. If the jacket 14 is applied to the inner surface of gas supply or house pipelines, the Inner diameter of the textile jacket, for example, adjusted so that it becomes a tube with a nominal inner diameter of 25 mm fits. An essential feature of the invention consists in the design of the tubular textile jacket, especially with regard to the structure of the warp threads

Figures 3 (B) and 3 (C) show an example of the tubular Lining material according to the invention, wherein

the tubular textile jacket made of warp thread 16 and weft threads 17 exists. Each warp thread consists of an elastic yarn 16A around which a left-hand twisted thread over its entire length Synthetic thread 16B and a right-twist synthetic thread 16C is wound. In particular, the tubular textile jacket consists of 117 warp threads 16, each of which consist of an elastic, 310 denier polyurethane yarn 16A, around the entire length of the one 150 denier crimped yarn made from a polyester fiber 16B left-hand twisted and a 150 denier crimped yarn

rare yarn made of polyester fibers is right-twisted; the weft threads 17 are obtained by twisting three 150 deniers strong, crimped yarns made of polyester fibers and with a spacing of the weft threads of about 8 weft threads / cm

(20 weft threads / inch) to form the textile jacket. 30th

The elastic polyurethane yarn alone can be used as a warp thread to increase elasticity. In this case However, there is a considerable elongation of the warp thread of up to about 700%. Partial or full use

such highly elastic yarn as a warp thread, however, leads to undesirable results; so can the tubular

^L J

34U531

Lining material cannot be routed evenly through the pipelines in curved sections, or the quality of the textile jacket becomes unevenly due to considerable local expansion differences between the elastic polyurethane yarn and the conventionally crimped or spun yarn. In the context of the invention it has been shown / that the elongation of such elastic polyurethane yarns is effectively reduced to a desired value down to about 120% Can be made by using normal or crimped synthetic yarns, preferably made from polyester fibers are, in one direction or in both directions (left and / or right) over the entire length of the elastic Twisted polyurethane yarn. When weaving the tubular textile jacket, the elastic polyurethane yarn is stretched State interwoven. If the weft thread is processed at a distance of about 8 weft threads / cm, the result is for the warp threads of the finished tubular textile jacket shrinks to about 18 warps / cm (45 warps / inch). As for the lateral direction, the textile jacket with a folded width of 43 mm is suitably heat-treated subjected, for example by immersion in hot water, so that the textile jacket to a fold width of 32 mm shrinks. The textile jacket obtained finally has a diameter of about 20.5 mm, but can easily pass through relatively small forces can be extended to a diameter of about 27 mm, which corresponds to the original folding width. A relatively high force is required if this textile jacket is to be expanded further, since the crimped Yarn has been stretched practically all the way. On the other hand, the textile jacket can penetrate up to about 100% in the longitudinal direction a relatively small force to be stretched; when the tensile force is released, the textile jacket practically shrinks back on its original length due to the elasticity of the elastic polyurethane yarns used as warp threads.

L ^J

γ ~ ^]

- 19 -

The yarn wrapped around the elastic polyurethane yarn over its entire length can be a normal yarn made of synthetic fibers e.g. a standard yarn made from polyester fibers, but preferably a yarn made from crimped synthetic fibers, e.g. a crimped yarn made of polyester fibers. According to a preferred embodiment, this yarn is made of synthetic fibers Wrapped around the elastic polyurethane yarn over its entire length in both directions (left and right). By Wrapping the synthetic fiber yarn in both directions can effectively reduce the large elongation of the elastic yarn and additionally a reinforcement of the elastic yarn can be achieved. According to another embodiment of the invention a yarn made of synthetic fibers, preferably a crimped yarn made of polyester fibers, around the elastic yarn wrapped both left and right. If the synthetic fiber yarn is only in wound around the elastic yarn in a single direction is the reinforcement of the elastic yarn with the yarn Synthetic fiber may be slightly worse than the case where the synthetic fiber yarn around the elastic yarn is wound in both directions; however, simple wrapping can be advantageous for economic reasons being one for practical use almost

achieved similar effects.
25th

In the context of the invention, other yarns than those mentioned above can also be used for the warp threads 16 of the textile jacket. Has been wrapped around the elastic yarn, preferably polyurethane elastic yarn to the normal and / or crimped synchronous ^υ thetikfasergarn or yarns preferably of polyester fibers in one or both directions over the entire length of the elastic yarn may be used together with conventional fiber yarns or spun yarns as Warp threads are used. In this case the ratio is

ger common fiber yarns or spun yarns to the

elastic yarn around which the normal and / or crimped L J

Synthetic fiber yarns have been wrapped, not particularly critical, but this ratio is preferably limited so that the warp threads eventually stretch by can have about 120%.

As such, the fiber yarns or spun yarns do not have so much elongation. Because the elastic polyurethane yarns to the a normal and / or crimped yarn or yarns have been wound over the entire length of the elastic yarn, im stretched state and interwoven as the fiber yarns or spun yarns as other constituents of the warp thread are also used, are also woven in the stretched state, the elastic yarns shrink because of them Elasticity, and the fiber yarns or spun yarns are also shrunk in the tubular textile jacket obtained State present. Therefore, the extensibility of the tubular textile jacket is enhanced by the presence of fiber yarns or spun yarn not adversely

impaired.
20th

The elastic yarn used as a special warp thread according to the invention is not limited to polyurethanes. Elastic threads made of natural or synthetic rubber, such as butyl, AS, ASB or EPDM rubber, can be used instead of the elastic yarn made of polyurethane can be used. In the case of natural rubber thread, however, the material deteriorates of the natural rubber itself due to ultraviolet radiation or heat, and moreover, the ductility is worse than elastic polyurethane yarns. Demon

opposed to most synthetic rubbers are opposed to natural rubber significantly improved in terms of their resistance to material deterioration. Hence can elastic polyurethane yarns as well as material-resistant synthetic rubber threads for the elastic yarn in the tubular Lining material can be used according to the invention. However, because of the superior fiber properties

L J

34U531

^Γ - 2! -

According to the invention, elastic polyurethane yarns are particularly preferred as elastic yarns for the warp threads.

The yarn used for the weft 17 is not limited to normal and / or crimped yarns made of polyester fibers. The weft thread can consist of normal and / or crimped yarns from other synthetic fibers. Of the The use of crimped yarns, in particular made of polyester fibers, is preferred according to the invention, since such entangle crimped yarns as wefts with the warp threads can and the adhesion of the charge of the impermeable synthetic resin to the woven tubular Improve textile coat. The weft thread can also be an elastic yarn made of polyurethane, around a normal one and / or crimped synthetic fiber yarn or yarns in one is wound in one direction or in both directions over the entire length of the elastic yarn, similar to the warp thread. Such a weft thread is much more elastic than the crimped synthetic fiber yarn, so that a heat treatment

for shrinking the tubular textile jacket in a lateral direction to achieve the reduced folding width is not required. If the tubular lining material is used in pipelines with very strong fluctuations of the inside diameter is to be used is the

Use of this weft thread is particularly suitable because it is very much related to the varying inside diameter of the pipelines adapts well.

If the lining material according to the invention is used in supply

supply or house pipelines for gas or water is used in accordance with the method according to FIG. 2, the required pressure medium pressure is preferably from 0.5 to 2.0 kg / cm ² . If the pressure medium pressure is too low,

becomes the lining material within the pipeline 35

not sufficiently expanded and turned while advancing. On the other hand, if the pressure medium pressure is too high

34U531

the lining material can be damaged. That turned tubular liner is stretched in the transverse direction at the same time as the stretching in the longitudinal direction. The lining material should preferably elongate at least at the pressure medium pressure in the longitudinal direction 10%. When the lining material has been stretched in the longitudinal direction with the help of pressure medium pressure is it on the long curved wall of a pipe elbow, like the supply branch 2a or 2b, '^ the bends 3a to 3e, the T-shaped section 5a and the Elbow 8, sufficiently stretched and shrunk on the shorter curved wall of the bend where the tensile force is not acts. In contrast, the known tubular lining material is insufficiently stretched in the longitudinal direction and thus loosens locally from the longer curved wall of the elbow, so that between the inner wall of the pipeline and the lining material forms a gap and thus the flow path for the gas or the water narrowed. If the known lining material is under pressure

action attached to the longer curved wall of the manifold there are large folds on the lining material in the area of the shorter curved wall of the bend, so that flow disturbances for the gas or the Give water. Since the lining material according to the invention

is stretchable and shrinkable under the action of pressure when turning, this lining material can adhere very well to the Create the curved wall of the bend and without forming creases on the inner surface of the pipelines both in the straight as well as the curved sections

be liable.

The tubular lining material according to the invention can also be in the diametrical direction or in the transverse direction

Stretched or shrunk under pressure. Therefore, 35

it can be stretched slightly to an inner diameter of about 26 mm, which is the original fold width when the

L J

34U531

Γ - Π

- 23 -

corresponds to tubular textile jacket. Because the inside diameter of the supply pipeline is almost equal to 27 mm in the straight section, the tubular lining material can be used also be firmly attached to the inner surface of the pipeline in the straight section. The tubular Liner material before stretching has a smaller inner diameter than the supply pipeline on its narrowest point, so that the tubular lining material in a somewhat stretched state with the inner surface of the pipeline is glued in this section without creases in the lining material or a gap between the lining material and the inner surface of the pipeline.

T _he external diameter of the lining material according to the invention is preferably 80 to 100% of the internal diameter of the pipeline in the narrowest portion. If the outer diameter is less than 80%, the lining material must be stretched considerably when it is turned. In this case, the tensile stresses of the coating on the tubular textile jacket are greater, so that the pressure medium pressure has to be increased and thus the probability of the unintentional formation of small holes in the coating increases. On the other hand, if the outer diameter exceeds 100%, wrinkles are formed on the lining material in the longitudinal direction in the region of the narrowest point of the pipeline, so that the lining material is not evenly applied to the inner surface of the pipeline

can.
30th

The outer diameter of the tubular lining material under pressure for turning is preferably 100 to 130% of the inside diameter of the pipe in the straight section. If the outside diameter is less than 100%

is, the lining material will not be tight against the inner surface of the pipe.

34U531

FIG. 4 schematically shows the cross section of a supply branch 2b and the state when the lining material is turned. The upper part of the supply branch 2b has an opening for the branch pipe and has a small one larger inner diameter than the riser pipe 6a. The inner diameter of the upper part is usually 34 mm and narrows to a thin section 18 at a distance of approximately 60 mm from the top; in this thin portion 18, the inner diameter becomes equal to that of the riser pipe 6a. The lining material 9 progresses at the same time when turning inside the branch pipe and enters the supply branch 2b when the rope-like element 10 is tightened when pressure is applied. When the outside diameter of the lining material 9 exceeds 130% of the inner diameter of the pipe, the front end 19, which is the turning point when turning the lining material forms, in the space of the upper part of the supply branch 2b, where the inner diameter becomes larger, widened considerably. As a result, the abnormally widened front end 19 of the lining material 9 becomes attached pressed against the inner wall of the thinning part 18 and deformed so that it is almost impossible to remove the lining material 9 to move down, even if the tensile force of the rope-like element 10 is increased, since the interior of the riser pipe 6a for the expanded front end 19 of the liner material is too tight. A similar problem arises when the elongation in the longitudinal direction of the warp thread exceeds 120%.

Therefore, surprising advantages with the inventive Lining material can be achieved, especially when lining pipelines with a relatively small inner diameter and large fluctuations in diameter, since the lining material according to the invention is expandable and shrinkable in one certain circumference in the longitudinal direction due to the special structure of the warp threads. These surprising advantages of the invention emerge from the comparison of FIGS. 4 and 5A to 5C.

34H531

Figures 5Α to 5C show the course when turning the lining material of the invention when passing through the supply branch 2b of the supply pipeline; the Reference numerals 2b, 6a, 9, 10, 18 and 19 have the same meaning as in Figure 4; the front end 19 of the lining material 9 is still in an outer one for better understanding curved portion 9a and divided into an inner curved portion 9b.

In Fig. 5 (A), the turning state is just ahead the supply branch 2b shown; the direction of the lining material 9 moving horizontally becomes after changed downwards when the downward force of the rope-like element 10 acts around the front end 19 of the lining material 9 to be directed downwards.

Figure 5 (B) shows the beginning when passing through the supply branch 2 B. The outer curved section 9a of the lining material 9 is relatively small Force stretched, while the inner curved section 9b, which is stretched by the pressure medium pressure, back into the original state shrinks, so that the front end of the lining material 9 slightly change its direction of movement can. In this state, the outer curved portion 9a becomes

not noticeably widened, in contrast to Figure 4.

Figure 5 (C) shows the final stage in passing through the Supply branch 2b, wherein the lining material 9 is pulled down with a relatively small force and through the

Dilution section 18 is guided easily and smoothly, so that the formation of wrinkles in the inner curved portion 9b is avoided.

In the known tubular lining materials

on the other hand, no consideration was given to suitable elongation in the longitudinal direction of the lining material to enable this

^L J

can also be adapted to pipelines with a relatively small inside diameter and strong inside diameter fluctuations, such as for supply or house pipelines for gas or water. When using known tubular lining materials there are therefore folds or constrictions in the flow path, in particular in the area of bends or kinks in the pipelines.

Figures 6 (A) and 6 (B) show the state when turning the Lining material at the beginning and at the end when the lining material is passed through the supply branch 2b in the supply line, the reference numerals 2b 6a, 9, 9a, 9b, 10, 18 and 19 have the same meaning as in the figures 5 (A) to 5 (C).

Figure 6 (A) shows the initial state when passing through the supply branch 2b. The lining material 9 without elasticity in the longitudinal direction occurs relatively far into the space of the supply branch 2b, so that the front end 19 almost reaches the center of the branch, although the through the rope-like element 10 downward force is sufficient to move the lining material according to the invention turn.

In Figure 6 (B), the final stage is being passed through the supply branch 2b is shown. The lining material 9 is with the help of a relatively strong force through the rope-like element 10 is pulled downwards and has passed through the thinning section 18. Since the lining material 9 does not allow elongation in the longitudinal direction and the tensile force is greater, the lining material 9 in the central part of the supply branch 2b forcibly bent so that the outer curved portion 9a is bent so that it cannot expand sufficiently. Therefore, the lining material 9 is bent and narrowed almost at right angles its cross-section, and beyond that, we

L J

- 27 -

gen the lack of elasticity in the longitudinal direction of the inner curved portion 9b folds.

A comparative experiment was conducted to examine this phenomenon using two lining materials which were identical in resin, coating thickness and transverse extensibility, except that the sample of the present invention was longitudinally extensible while the other sample was non-extensible. The sample, which was expandable by 20% in the longitudinal direction at a pressure of 1 kg / cm ² , could be passed through the supply branch 2b with an insertion force of 0.5 kg at the above pressure, while the other, non-expandable sample under the same pressure, had an insertion force 3 kg at the same pressure medium required to bring the sample through the supply branch 2b. In the case of the expandable lining material according to the invention, the outer curved section 9a of the front end in the supply branch 2b had an elongation of 50 to 60%. To achieve this technical effect, the elongation in the longitudinal direction of the lining material should be at least about 10% when the pressure medium is applied to turn it.

The lining material according to the invention consists essentially of a tubular textile jacket with a coating made of an impermeable synthetic resin and is characterized by the fact that the textile jacket itself when exposed a low tensile force in the longitudinal direction is elastic. These

^ characteristic properties of the lining material according to the invention can be achieved by using a special elastic yarn for part or all of the warp threads. An elastic yarn itself, for example an elastic one

Polyurethane yarn, has too much elongation, so that the Ein-35

Set of such elastic yarns as a warp thread is even disadvantageous can be. In the case of the warp threads used according to the invention a normal and / or curled synthetic fiber

L J

34H531

yarn or yarns in one direction or in both directions (left and / or right) around the elastic yarn over the whole of it Wrapped length so that the elastic yarn is completely wrapped with the synthetic fiber yarn and against damage is protected when turning the lining material inside the pipelines; this benefit is additional to the aforementioned advantage, according to which the elongation in the longitudinal direction of the elastic yarn can be controlled up to about 120% can. This allows the lining material of the present invention to be uniform and close to the inner surface of the pipelines can also be created in complicated bends and bends. Preferred as a yarn for wrapping the elastic Yarn is a crimped yarn made from synthetic fibers, especially polyester fibers, as the elastic yarn is completely made with

^ such a crimped yarn can be covered; this Crimped yarn has a large number of intricately wound fibers extending from the fiber body; this crimped yarn is strongly entangled with the similarly crimped yarn of the weft, so that a liquid

or viscous, curable synthetic resin that is applied as an impermeable coating to the tubular textile jacket to be able to penetrate in an advantageous manner into the tissue and thus the impermeable coating from flexible synthetic resin with the tubular textile jacket

firmly connects or glued. The warp threads can only consist of an elastic yarn or of an elastic yarn and conventional fiber yarns or spun yarns Yarns. In the latter case, i.e. when using elastic yarns as part of the warp threads, the strengthening

speed of the tubular lining material can be maintained in the longitudinal direction.

In contrast to main pipelines, supply and house pipelines generally have a small internal diameter.

knives and many complicated bends and kinks with a large fluctuation in the inner diameter. With him-

L J

34H531

- 29 -

1 inventive, tubular lining material can for the first time supply or house pipelines with a lining material for reinforcement and in good conformity with the complicated shape of the pipelines

5 without there being wrinkles in the lining material or without a gap being formed between the pipeline and the lining material. These benefits are with the well-known linings of pipelines with small inner diameters and many bends in complicated shapes

¹⁰ men not possible.

L J

Claims (10)

VOSSlUS - VOSSIUS TAUCH NER HEUNtMANN RAUH PATENTANWÄLTE SIEBERTSTRASSE 4-8OOO MÜNCHEN 86 PHONE: (O89) 47 4 O 75 CABLE: BENZO L PATENT MDNCHRN TfZLfIX B-29 453 VOPAT D uZ: S 973 (Hc 173) · April Case: FP 174 / WG TOKYO GAS COMPANY LIMITED, Tokyo / Japan and ASHIMORI INDUSTRY COMPANY, LIMITED, Osaka / Japan "Hose-shaped lining material for pipelines, 1 ^ in particular with non-straight sections" claims 1. Tubular lining material for pipelines, in particular with non-straight or curved sections with a tubular textile jacket made of warp threads and weft threads that are woven into a tubular shape, the textile jacket having a coating of a flexible synthetic resin is coated and can be applied to the inner surface ^ of the pipeline in such a way that the tubular lining material with a binder or an adhesive on its inner surface in the pipeline introduced and within this, if necessary with the help of a pulling, rope-shaped, elongated egg Mentes is moved forward while being turned under the action of a pressure medium, so that the lining material is applied to the inner surface of the pipeline and thereby placing the binder or adhesive between the pipeline and the lining material is characterized in that some or all of the warp threads are made of an elastic yarn so that a synthetic L J yarn or yarns are wrapped left and / or right. 2. Lining material according to claim 1, characterized shows that the weft comprises a synthetic yarn. 3. Lining material according to claim 1 or 2, characterized in that that the weft thread consists of an elastic yarn around which a synthetic yarn over its entire length Thread has been wound counterclockwise and / or clockwise. 4. Lining material according to one of claims 1 to 3, characterized in that one as elastic yarns elastic polyurethane yarn is used. 5. Lining material according to one of claims 1 to 4, characterized in that the synthetic yarn of the warp and / or the weft is a crimped yarn is made of polyester fibers. 6. Lining material according to one of claims 3 to 5, characterized in that the elastic yarn is a is elastic polyurethane yarn. 7. Lining material according to any one of claims 3 to 6, characterized in that the synthetic yarn is a is crimped yarn made of polyester fibers.
30th 8. Lining material according to one of claims 1 to 7, characterized / that it has an extensibility of 10 has up to 100% in the longitudinal direction. 9. Lining material according to one of claims 1 to 8, characterized in that its outer diameter is 80 to 100% of the inner diameter of the pipeline to be treated at its narrowest point. 34U531 1 10. Lining material according to one of claims 1 to 9, characterized in that its outer diameter upon action of the pressure medium for turning the lining material 100 to 130% of the inner diameter of the 5 acting pipeline in its straight section. L J